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प्रश्न
Give a chemical test to distinguish between the following gases.
H2 and O2
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उत्तर
| Hydrogen | Oxygen |
| Apply a burning splint to the gas: Pure hydrogen burns with a pale blue Flame when a burning splint is brought near it. | Apply a burning splint to the gas: It rekindles a glowing wooden splinter. |
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संबंधित प्रश्न
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
State the conditions necessary for a chemical change or reaction.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give a chemical test to distinguish between the following gases.
HCl and H2S
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Why is spoiling food a chemical change?
The reaction of H2 gas with oxygen gas to form water is an example of ______.
